New changelog entries:
* Merge from upstream version 0.8.20
* Update all Unity Group header icons (LP: #837254)
* group-{apps,files,folders,music,purchase,songs}.
* This release by itself does not effect changes; but future optional
add-ons such as 'unity-lens-music' may choose to make use of the
additional icons and as-such may in turn require UIFe (LP#861456)

New changelog entries:
* Merge from upstream version 0.8.20
* Update all Unity Group header icons (LP: #837254)
* group-{apps,files,folders,music,purchase,songs}.
* This release by itself does not effect changes; but future optional
add-ons such as 'unity-lens-music' may choose to make use of the
additional icons and as-such may in turn require UIFe (LP#861456)